ML20092A258
| ML20092A258 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 08/30/1991 |
| From: | Stols R COMMONWEALTH EDISON CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 9202100026 | |
| Download: ML20092A258 (3) | |
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\\{-) r / c 1400 Opus Place W ]g j-Downers Grove, lilinois 60$15 ( , m, m,- \\6f~ August 30,1991 Old g%, 7ibr ~ D Mr. A. Bert Davis mN-.); e Regional Administrator 'C U.S. Nuclear Regulatory Commission 799 Roosevelt Road-Rill Glen Ellyn,11-60137-
Subject:
Quad Cities Nuclear Power Station Units 1 and 2 Exairation of Regional Walver of Compliance NEG_Doche1NosJ0 2E4_and_50:205 o
Reference:
(a) R. Stols to A. Bert Davis letter dated August 14,1991 (b) C. Paperiello to Cordell Reed dated August 14,1991
Dear Mr. Davis:
Reference (a) documented Commonwealth Edison's request for a Regional Walver of Compliance which was granted by Region ill management on August 13, 1991. Reference (b) provided formal documentation of the approval. The expiration of - the Regional Waiver of Compliance was to occur on August 20,1991 at 6:15 p.m. On August 16i1991 Quad Cities Station performed a escondary containment test to demonstrate that the secondaiy containment could maintain a 0.25 inch vacuum under calm wind conditions with a standby gas treatment flow of 4000 cfm. As such, 1 secondary containment operability was demonstrated in accordance with Technical - Specification 4.7.C.1.c. The Office of Nuclear Reactor Regulations Duty Officer was notified at C:25 p.m. on August 16,1991 that secondary containment test was in progress and was maintaining 0.379 inch vacuum. L l L i 1 0' gp 51%1 9 g 210gg y Q88 / sci:1127:9 4 i 1
~ -- Mr. A. Bert Davis August 30,1991 The final test results demonstrated that secondary containment could maintain 0.395 inch vacuum under calm wind conditions with a standty gas treatment flow of 4000 cim. This value is uncorrected for wind s aeed, temperature and elevation. The Walvor of Compliance was formally ex ted at 7:15 p.m. on August 16,1991. A summary of the secondary containment test is provided in the attachment. If there are any questions or comments regarding this submittal, please contact J. Schrage at (708) 515 7283. Very truly yours, Rita Stols Nuclear Licensing Administrator i cc: R.J. Barrett, Project Director - NRR L.N. Olshan, Project Manager NRR 'J/.D. Shafer, Branch Chief - Rill B.L. Burgess,' Section Chief - Rlli T.E. Taylor, Senior Resident inspoutor - Quad Cities Document Control Desk /scl:1127:10
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SUMMARY
OF SECONDARY CONTAINMENT TEST AUGUST 16,1991 !ntroducilon On August 16,1991, Quad Cities Station conducted a test of secondary containment to demonstrate that secondary containment can maintain an average 1/4 inch water vacuum under calm wind conditions with a filter train flow rate of not more than 4000 cfm (Technical Specification 4.7.C.1.c). Iesmerformance The test was conducted during a wind speed of approximately 11.9 mph (at 196' elevation) in a 162.5 direction. The outside air temperature was 80.6 F and the average inside temperature was 96.5 F. The test was initiated by simulating a high radiation signal to isolate the Unit One and Two Reactor Building Ventilation System in response to the isolation, the "A" train of standby gas treatment (SBGT) automatically initiated. SBGT flow was 4000 cfm. Differential pressure readin0s were recorded after reaching equilibrium conditions. The average differential pressure which was mainiained by the secondary containment was 0.395 inches water vacuum. The individual readings were as follows: L South wall at elevation 690': 0.405 inches water vacuum East wall at elevation 690': 0.400 Inches water vacuum North wall at elevation 690': 0.380 inches water vacuum West wall at elevation 690': 0.395 inches water vacuum Conclusion Secondary containment was demonstrated to be operable per the l requirements of Technical Specificatioif 4.7.C.1.c. The next secondary containment test will be performed prior to the Unit 2 Refueling Outage which is scheduled to begin on December 28,1991. i I RS/ sci:1067:19}}